Android sip soft phone

Hello We needed a carrier grade Symbian VOIP / SIP Dialer for Symbian Mobile Phones which should be work all standard SIP blocked countries like UAE, OMAN with the following criteria,, * Full Source Code and Training * should be handle any number of Registration without hung as per the server capacity * With/Without Operator code function. * Fully customized for different brands * Support G729, G723, Codecs * Support All kind of Soft Switch * Support All Symbian Devices which able to connect internet means ,S60 3rd Edition F1,F2, S60 5th Edition, Symbian^3, N8, C7, N97, C5 and all * Application should work all Networks 3G/Wi-Fi/2G or GPRS. * Phone full contact book sync * Real time Balance Display * Loudspeaker * Account to Account Balance transfer * Call Duration * Call Log * Redial/Call from Call logs * Dynamic dialer setting . Means Application settings should be download only when the dialer register with server, do not with application install * Simple to use User Friendly Interface. Please bid if you are confident to develop the soft phone,please contact serious developers only if they can do it in correct time frame